[docs] Update devdocs dependencies

[jcalcaben]

Description

Updates the node and ruby dependencies for the pwa-devdocs site project.
This PR also removes the {{site.baseurl}} prefixes from internal links since it is no longer required by Jekyll 4.

Acceptance

@jcalcaben

Verification Stakeholders

@jcalcaben

Verification Steps

1. Navigate to the pwa-devdocs directory
2. Install updated deps: bundle install && npm install
3. Build a production version of the docs: npm run build:production
4. Verify build succeeds
5. Rename _site directory to pwa-studio: mv _site pwa-studio
6. Re-create _site directory and move pwa-studio into it: mkdir _site && mv pwa-studio _site
7. Run an http server on _site: npx http-server _site
8. Navigate to localhost:8080/pwa-studio
9. Verify site renders.
10. Click on links to other doc topics in top nav, side nav, and content
11. Verify links to other topics within the docs are not broken

Screenshots / Screen Captures (if appropriate)

Checklist

• I have updated the documentation accordingly, if necessary.
• I have added tests to cover my changes, if necessary.

[PWAStudioBot]

	Fails
🚫	No linked issue found. Please link a relevant open issue by adding the text "closes #<issue_number>" or including the associated JIRA ID in your PR.

	Messages
📖	Access a deployed version of this PR here. Make sure to wait for the "pwa-pull-request-deploy" job to complete.
📖	DangerCI Failures related to missing labels/description/linked issues/etc will persist until the next push or next nightly build run (assuming they are fixed).

Generated by 🚫 dangerJS against a5f3bb3

[supernova-at]

When I searched for site.baseurl in what's left I found the following:

Not sure if they're still needed or not.

[jcalcaben]

These are still legitimate uses. Only links that use the link tag need to be updated since the base url is already prefixed.

[supernova-at]

I did not run the verification steps. (I really need to get that set up...)

I can if you need.

[jcalcaben]

There's no need. @dpatil-magento has the docs environment set up and can verify